ALSA Initialization

snd_pcm_hw_params_t *hardwareParams;

 

Steps:

snd_pcm_hw_params_malloc(&hardwareParams) -- allocate ALSA hardware parameters

                  ||

                  //

snd_pcm_hw_params_any(handle->handle, hardwareParams) -- configure hardware

                  ||

                  //

snd_pcm_hw_params_set_access(handle->handle, hardwareParams, SND_PCM_ACCESS_RW_INTERLEAVED)

                  ||

                  //

snd_pcm_hw_params_set_format(handle->handle, hardwareParams, handle->format);

                  ||

                  //

snd_pcm_hw_params_set_channels(handle->handle, hardwareParams, handle->channels);

                  ||

                  //

snd_pcm_hw_params_set_rate_near(handle->handle, hardwareParams, &requestedRate, 0);

                  ||

                  //

snd_pcm_hw_params_set_buffer_size_near(handle->handle, hardwareParams, &bufferSize); 

                  ||

                  //

snd_pcm_hw_params_set_buffer_time_near(handle->handle, hardwareParams, &latency, NULL);

                  ||

                  //

snd_pcm_hw_params_get_buffer_size(hardwareParams, &bufferSize)

                  ||

                  //
snd_pcm_hw_params_get_buffer_time(hardwareParams, &latency, NULL);

                  ||

                  //

unsigned int periodTime = latency / 4; 

err = snd_pcm_hw_params_set_period_time_near(handle->handle, hardwareParams, &periodTime, NULL);   

                  ||

                  //

snd_pcm_hw_params(handle->handle, hardwareParams);